To correctly identify common nouns, we need to understand that they are general names for people, places, things, or ideas, and they are not capitalized unless they begin a sentence.
Answer: денек, букет, дом, кот, пёс, Гусар, Сторож, Васька, дачу, Село, гречанино, Джин, кошкой, муськой, саша, Улице